| 滇池沉积物中氮的地球化学特征及其对水环境的影响 |
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| 引用本文： | 朱元荣,张润宇,吴丰昌.滇池沉积物中氮的地球化学特征及其对水环境的影响[J].中国环境科学,2011,31(6):978-983. |
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| 作者姓名： | 朱元荣 张润宇 吴丰昌 |
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| 作者单位： | 1. 北京师范大学水科学研究院,北京,100875;中国环境科学研究院国家环境保护湖泊污染控制重点实验室,北京,100012
2. 中国科学院地球化学研究所环境地球化学国家重点实验室,贵州贵阳,550002 |
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| 基金项目： | 国家"973"项目，国家自然科学基金资助项目 |
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| 摘 要： | 采用连续分级提取法研究了滇池外海8个典型区域表层沉积物中总氮与生物有效性氮的含量分布特征,并探讨了不同形态氮释放的影响因素及其对水环境潜在的风险.结果表明,沉积物中总氮含量变化为1888.8~3155.8mg/kg,各形态氮的相对比例为残渣态氮(Residual-N,46.2%~66.3%)>强氧化剂可提取态氮(SOEF-N,22.9%~42.9%)>离子可交换态氮(IEF-N,4.5%~7.5%)>弱酸可提取态氮(WAEF-N,2.2%~4.0%)>强碱可提取态氮(SAEF-N,2.7%~3.8%).生物有效性氮包括IEF-N、WAEF-N、SAEF-N和SOEF-N,海埂沉积物中生物有效性氮的含量最高,与该区域的富营养化程度相一致.其中, IEF-N的分布与上覆水体中氮的含量关系密切,SOEF-N是水体中氮的重要来源.另外, NH4+-N是IEF-N、WAEF-N及SAEF-N中的主要组成部分.蓝藻水华严重的海埂沉积物IEF-N中的NH4+-N含量相对较低,可能表明了富营养化湖泊中浮游生物的大量繁殖与沉积物氮循环之间的耦合关系.
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| 关 键 词： | 沉积物 氮形态 生物有效性 滇池 |
| 收稿时间： | 2010-10-06; |
Geochemical characteristics and influence to overlying water of nitrogen in the sediments from Dianchi Lake |
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| ZHU Yuan-rong,ZHANG Run-yu,WU Feng-chang.Geochemical characteristics and influence to overlying water of nitrogen in the sediments from Dianchi Lake[J].China Environmental Science,2011,31(6):978-983. |
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| Authors: | ZHU Yuan-rong ZHANG Run-yu WU Feng-chang |
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| Institution: | ZHU Yuan-rong1,2,ZHANG Run-yu3,WU Feng-chang1,2(1.College of Water Sciences,Beijing Normal University,Beijing 100875,China,2.State Environmental Protection Key Laboratory for Lake Pollution Control,Chinese Research Academy of Environmental Sciences,Beijing 100012,3.State Key Laboratory of Environmental Geochemistry,Institute of Geochemistry,Chinese Academy of Sciences,Guiyang 550002,China) |
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| Abstract: | The distribution characteristics of total nitrogen and bioavailable nitrogen form was analyzed by chemical sequential extraction method in eight representive sediment samples collected from Dianchi Lake.The factors that influence the release of nitrogen form and its potential risk to the overlying water were discussed.The result showed that the concentrations of total nitrogen(TN) ranged from 1888.8mg/kg to 3155.8mg/kg and the relative concentrations of different nitrogen form ranked according to the follow... |
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| Keywords: | sediment nitrogen form bioavailability Dianchi Lake |
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